rauchwetter



April 22 1924. 1,491,495

F. RAUCHWETTER REVERSIBLE DRIVE FOR CALCULATING MACHINES Filed Dec. 14 1922 5 Sheets-Sheet 1 April 22 1924.

F. RAUCHWETTER REVERSIBLE DRIVE FOR CALCULATING MACHINES Filed Dec. 14, 1922- 5 Sheets-Sheet 2 April 22 1924. 1,491,495

F. RAUCHWETTER REVERSIBLE DRIVE FOR CALCULATING MACHINES Filed Dec. 14, 1922 5 Sheets-Sheet 5 //7 ventor: w W/% Mai/5 7 EM April 22 1924.

v F. RAUCHWETTER REVERSIBLE DRIVE FOR CALCULATING MACHINES Filed Dec. 14, 1922 5 Sheets-Sheet 4 April 22 1924. 1,491,495

F. RAUCHWETTER REVERSIBLE DRIVE FOR CALCULATING MACHINES Filed Dec. 14, 1922 5 Sheets-Sheet 5 I /n ven tor:

w @M a W W- Patented Apr. 22, 1924.

UNITED STATES PATENT OFFICE.

FRANZ RAUCHWETTER, DECEASED, LATE OF BERLIN-FRIEDENAU, GERMANY; BY ALFRED FLATER, ADMINISTRATOR, O'F BERLIN, GERMANY.

REVERSIBLE DRIVE FOR CALCULATING MACHINES.

Application filed December 14, 1922. Serial No. 606,985.

To all whom it may concern.

Be it knownthat FRANZ RAUCHwni'rnn, late a citizen of the German Republic, and a resident of'Berlin-Friedenau, Germany, invented certainnew and useful Improvements in Reversible Drives for" Calculating Machines, of which the following is a specification.

The object of the invention belongs to the class ofcalculating machines having a reversible drive for the countingmechanism, the driving element retaining its position permanently, while the counting mechanism by a sideway displacement preliminarily indicated by a key (subtractionkey) and completed by themachine crank is adjusted in such a manner that instead of the direct spur wheel drive from the driving element on to the counting mechanism disc an indirect drive takes place by interposing an auxiliary wheel and thus by a counter running turning of the counting mechanism discs.

With such counting mechanism drives a,

spur wheel-change speed gear has already been arranged in the counting mechanism, the change speed gear co-operating with a fixed or non-slidable driving wheel in such a manner thatin the ordinary position (in case of addition or multiplication) the driving toothed wheel of the adjusting mechanism engages directly with the driven wheel of the counting mechanism and after a reversal of the counting mechanism the driving toothed wheel of the adjusting mechanism meshes with the. interposed wheel. Y 7

According to. the present invention the driving of thecounting'mechanism is also effected by a single and unslidable driving element of the adjusting mechanism which can be made to engage with an indirect 'or direct toothed wheel according to the setting of the counting mechanism. These toothed wheels of the counting mechanism, the direct and the indirect one, are placed closely side by side and consist of such a narrow construction that a comparatively very slight displacement of the countin mechanism sufiices to effect the reversa. This very slight displacement can be effected in the manner that a knife constructed as a bell crank lever is pressed between two rollers a fixed frame roller and a roller fixed to the counting mechanism and movable with the latter so that the counting mechanism is moved by the width of the thickness of the knife which is forced between the two rollers.

Since in this manner the moving path is extremely small, the accelerations of masses to be overcome are also very small, so that the amount of work required remains small and in particular a quick drive is possible. As for the pressing of the knife between the two rollers, the fixed frame roller and the roller on the counting mechanism, a greater pressure isrequired, it is preferable to effect the setting especially in case of calculating machines having a motoric drive, in a manner known in itself, not directly by the subtraction key but indirectly by it in the mannerthat through it a drive is preliminarily set which then from the machine crank effects the reversal of the counting mechanism.

Upon the accompanying drawing two modes of carrying out the invention are shown and it is:

Fig. 1, a side view of the machine,

Figs. 2 and 3 show the front view of two different positions of two counting mechanism elements, while Figs. 4, 5 and 6 show in a second mode of carrying out the invention in various positions the indirect drive for the side shifting of the counting mechanism for reversing by the reversing key.

According to the drawing 1 denotes the known driving sector of a multiplying or adding machine, the sector driving the counting mechanism 2. As it is the case with the known constructions, the toothed sector 1 for this purpose meshes in the driving position with a toothed wheel 3 which engages with the driven wheel of the counting mechanism 2., Adjacent to the toothed wheel 3 is mounted a small spur wheel 4, which does not mesh directly with the toothed wheel 3 of the counting disc but with the interposition of a further spur wheel 5 so that when the toothed sector 1 meshes with the driven wheel 4, the counting mechanism 2 and thus the counting disc are driven in the reversed direction as before.

In such a case it is essential for the present invention that a slight side movement of the counting mechanism without any alteration of position and of meshing of the toothed sector 1 suffices for the reversal in contradistinction to the known constructions, where the driving element itself for the purpose of enabling the reversal with various places of its teeth must be made to engage with the direct or indirect driving wheel. The reversal of the counting mechanism in case of the mode of construrtion according to Figs. 1- 3 by means of a reversing key 6, actuating a leverdrive 7, 8, 9 from which a bell crank lever 10 is swung out which with a sharp and knife-like projection 11 pierces between a tired roller 12 and a roller 13 attached to the counting mechanism and thereby the counting mechanism is moved by the dis tance of the two wheels 3 and 4; from each other. As a direct moving of the spring actuated counting mechanism of masses which are great in case of a larger number of places is not very easy, in case of the mode of construction according to Figs. 4-6 from the reversing key 6 by means of levers T, 8 in the first place a bell crank lever 9 is turned, the pin 14 of which in such a case being displaced along the front face of the guide 15. This guide is under the influence of a spring 17 acting on the arm 16 of the bell crank lever 9. From the machine shaft 18 a bell crank lever 20 swinging about the journal 19 is turned, as soon as the roller 21 strikes against its projection 22 and lifts the latter out. The guide hinged to the pin 24 of the bell crank lever 20 was slightly lifted up upon a turning of the bell crank lever 9, as with its other end and by means of a slot 25 it was attached to the pin 26 on the arm 16 of the bell crank lever 9, so that its projection 27 bent to the side enters into the path of the head-face 28 of the guide 15. if upon a continuation of the movement of the guide this projection 27 strikes against the head face 28 of the guide 15, compare Fig. 5, this guide 15 is moved in the direction of the arrow, it thereby swings out the bell crank lever 10 and thereby forces the rollers 12 and 1.3 apart. At the same time the guide 15 is moved until its front face has slid past the pin let and it can now be lifted by the spiral springs 17 so that the pin 14 places itself behind the front face 29, compare Fig. 6. Hereby the counting mechanism is held locked in the reversing position.

A characteristic feature of this drive is that from the reversin key 6 solel the reversal is preliminarily adjusted by a swinging out of the bell crank lever 9' while it is completed from the bell crank lever 20 which again is moved by the machine shaft.

I claim as my invention:

1. Reversible counterdrive for calculating machines comprising a carriage for the counter-mechanism laterally displaceable by means of a key (subtraction key) said counter-mechairism comprising change spur gears each consisting of two sets of spur gears and comprising furthermore, gears meshing with said change speed gears and which are not displaceable, a knife controlled from the supporting key, said knife being wedge shaped and the thickness of the knife being equal to the distance of two spur gears of change speed spur gear drive, and furthermore combined with a roller fixedly supported in the frame of the machine, and another roller secured to the carriage of the counter-mechanism between which rollers the wedge shaped knife enters upon depression of the key.

2. Reversible counterdrive, comprising a counter-mechanism having a change speed spur gear drive comprising two sets of spur gears, a roller fixedly supported in the frame of the machine and another roller adjacent thereto, supported in the carria e of the counter-mechanism, a wedge shaped knife insertible between these rollers, a key, a bell crank lever actuated b said key, a pusher rod arranged to be elevated by said bell crank lever and also arranged to be actuated from the machine shaft, a stop on the said pusher rod, a link which is advanced by the said stop and having a recess, a pin on the bell crank lever arranged to enter said recess upon passing the said link.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ALFRED FLATER, Administrator of Franz Rauchwetter, de-

ceased.

Witnesses:

E. HOLTZERMANN, ROGER T. Ausracn. 

